From a1cb2eb12a0ea295deb1d13afcba5ce566849ed6 Mon Sep 17 00:00:00 2001
From: Vadim Zeitlin <vadim@wxwidgets.org>
Date: Thu, 25 Jan 2018 14:55:31 +0100
Subject: [PATCH] Also return display DPI from wxScreenDC in wxGTK3

This is similar to the previous commit and is done for the same reasons:
screen DC needs to use the same DPI as the screen itself, instead of the
default Cairo 72 DPI.
---
 include/wx/gtk/dc.h | 2 ++
 src/gtk/dc.cpp      | 6 ++++++
 2 files changed, 8 insertions(+)

diff --git a/include/wx/gtk/dc.h b/include/wx/gtk/dc.h
index de09ee2494..3e3b600f68 100644
--- a/include/wx/gtk/dc.h
+++ b/include/wx/gtk/dc.h
@@ -76,6 +76,8 @@ class wxScreenDCImpl: public wxGTKCairoDCImpl
 public:
     wxScreenDCImpl(wxScreenDC* owner);
 
+    virtual wxSize GetPPI() const wxOVERRIDE;
+
     wxDECLARE_NO_COPY_CLASS(wxScreenDCImpl);
 };
 //-----------------------------------------------------------------------------
diff --git a/src/gtk/dc.cpp b/src/gtk/dc.cpp
index ed846c0899..ccd61f9b02 100644
--- a/src/gtk/dc.cpp
+++ b/src/gtk/dc.cpp
@@ -364,6 +364,12 @@ wxScreenDCImpl::wxScreenDCImpl(wxScreenDC* owner)
     gc->EnableOffset(m_contentScaleFactor <= 1);
     SetGraphicsContext(gc);
 }
+
+wxSize wxScreenDCImpl::GetPPI() const
+{
+    return wxGetDisplayPPI();
+}
+
 //-----------------------------------------------------------------------------
 
 wxMemoryDCImpl::wxMemoryDCImpl(wxMemoryDC* owner)